Missfiring when cold and under load.., help Options

[tufy]

3 months ago i break my gearbox. after i changed it with a 2nd hand gearbox, i started to have some misfiring proplems when car is cold and over 1.3 bars boost.
i installed new sparks, wires, distrubutor cab, rotor arm. and i still have this damn proplem.. dont know what to do. did any one experienced some thing like this.?

[brianforster]

when i had a misfire at idle and hesitation i went through every single thread on mr2oc and tried everything.. well one day i finally figured out that my pigtails for my injectors were worn and not making good contact, pushing on the pigtail would make it stop misfiring so i ended up replacing the pigtails..

id suggest first finding out which cylinder is misfiring by pulling out the spark plug wire and seeing if the misfire pattern changes, then from there check the pigtail

[tufy]

when i had a misfire at idle and hesitation i went through every single thread on mr2oc and tried everything.. well one day i finally figured out that my pigtails for my injectors were worn and not making good contact, pushing on the pigtail would make it stop misfiring so i ended up replacing the pigtails..

id suggest first finding out which cylinder is misfiring by pulling out the spark plug wire and seeing if the misfire pattern changes, then from there check the pigtail

i ll try this tomorrow. i was talking with a friend of mine that he is mechanic. he said it is not an electrical proplem. may be a hose leaking air to intake manifold. of from injectors. beacuse car has some black smoke and eating to much petrol.